Not "helthy", he said "highest value" and you are right! Candy does have pretty much the most bioavaliable energy, thats why we love it, so you make a very good point and further prove what Salad-Tycoon is saying.

You might be confused, the highest value is generally what we call fats. Sugars (aka carbohydrates) have the same calorie density than proteins (broadly speaking, it seems to heavily depend on the metabolism of each individual, the type of food, etc.)

That's why you would rather bring nuts/peanut butter and crisps to a ultralight hike and not a bag of sugar or candies.

The only nutrient that candy has is added sugar, which is of decidedly low value ( one of the few commonly-consumed ‘nutrients’ of which the ideal amount is probably zero)